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Re: st: Adding variables to datasets


From   Kyle Peyton <kyle.peyton@unimelb.edu.au>
To   "<statalist@hsphsun2.harvard.edu>" <statalist@hsphsun2.harvard.edu>
Subject   Re: st: Adding variables to datasets
Date   Sun, 17 Jul 2011 21:46:28 +0000

Hi Maria,

I believe the 'keep' command will work with the merge so that you can isolate the variables you need. Details should be under the help section for merge. 

Hope that helps! 
Kyle

On 18/07/2011, at 5:38 AM, "mmolina@uniroma3.it" <mmolina@uniroma3.it> wrote:

> Dear Statalist,
> 
> I'd need to combine three datasets.
> 
> For the first two, I do:
> 
> use filename
> 
> append using filename
> 
> and it's fine. Now I'd like to add only one variable from a third dataset.
> This variables matches with id from the previous two (it is a new variable
> about observation id from a previous year).
> 
> I tried again with 'append using filename' but it generates too many
> missing values.
> 
> Could you please help me?
> 
> Thanks,
> 
> Maria
> 
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